NX2124ACSTR datasheet(1/17 Pages) MICROSEMI

tên linh kiện	NX2124ACSTR

Giải thích chi tiết về linh kiện	300kHz SYNCHRONOUS PWM CONTROLLER

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nhà sản xuất	MICROSEMI [Microsemi Corporation]

Trang chủ	http://www.microsemi.com

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NX2124/2124A

1

Rev.1.8

02/28/08

TYPICAL APPLICATION

DESCRIPTION

n Bus voltage operation from 2V to 25V

n Fixed 300kHz voltage mode controller

n Internal Digital Soft Start Function

n Prebias Startup

n Less than 50 nS adaptive deadband

n Current limit triggers hiccup by sensing Rdson of

Synchronous MOSFET

n No negative spike at Vout during startup and

shutdown

n Pb-free and RoHS compliant

ORDERING INFORMATION

FEATURES

300kHz SYNCHRONOUS PWM CONTROLLER

APPLICATIONS

PRELIMINARY DATA SHEET

Evaluation board available.

Device

Temperature

Package

Frequency

OCP Threshold

Pb-Free

NX2124CSTR

0 to 70oC

SOIC-8L

300kHz

360mV

Yes

NX2124ACSTR

0 to 70o C

SOIC-8L

300kHz

540mV

Yes

Figure1 - Typical application of 2124

The NX2124/2124A controller IC is a synchronous Buck

controller IC designed for step down DC to DC con-

verter applications. It is optimized to convert bus volt-

ages from 2V to 25V to outputs as low as 0.8V voltage.

The NX2124/2124A operates at fixed 300kHz, employs

fixed loss-less current limiting by sensing the Rdson of

synchronous MOSFET followed by hiccup feature.

NX2124A has higher current limit threshold than NX2124.

Feedback under voltage also triggers hiccup.

Other features of the device are: 5V gate drive, Adaptive

deadband control, Internal digital soft start, Vcc

undervoltage lock out and shutdown capability via the

comp pin.

Pb Free Product

n Graphic Card on board converters

n Memory Vddq Supply in mother board applications

n On board DC to DC such as

5V to 3.3V, 2.5V or 1.8V

n Hard Disk Drive

n Set Top Box

8k

R3

10k

R2

7

M3

C4

100uF

L2 1uH

+1.8V 9A

Vout

3

6

4

8

2

1

5

Gnd

Ldrv

Hdrv

SW

FB

BST

Vcc

C3

1uF

C5

1uF

Cin

280uF

18mohm

Vin

+5V

D1

M1

M2

L1 1.5uH

Co

2 x (1500uF,13mohm)

C6

0.1uF

COMP

4k

R1

C1

4.7nF

37.4k

R4

C2

2.2nF

HI=SD

C7

27pF

R5

10

MBR0530T1

Số phần tương tự - NX2124ACSTR

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